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| The Hearing Aid Museum | Hearing Aids of all types—Ear Trumpets, Carbon Hearing Aids, Vacuum Tube Hearing Aids, Transistor Hearing Aids, Body Hearing Aids, Eyeglass Hearing Aids and much more! | | | |
| Click on the "General Information" button (top button above) for an overview and general information on this category of hearing aid. | | Vacuum Tube Hearing Aids: 1921-1953 | Fortiphone Model 23 Vacuum Tube Hearing Aid The Fortiphone model 23 vacuum tube hearing aid was manufactured by Fortiphone Ltd. of London about 1952 or 1953. This hearing aid weighed 4 oz. including batteries. It measured 3⅛" x 1⅞" x ¾". |  | Click picture for larger view | | |  | | | | | The back opened showing the battery compartment. The Fortiphone 23 was powered by a 30 volt "B" battery type 506E, and a 1.4 volt RM-1 mercury "A" battery.
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